.page-nav {
  height: 100vh;
}

.page-nav .layui-nav {
  height: 100%;
}

.layui-header__desc {
  font-size: 18px;
  color: #fff;
  text-align: center;
  line-height: 60px;
}

.layui-body {
  padding: 20px 25px;
}

.layui-body iframe {
  width: 100%;
  height: 100%;
}